A high permeability Fe-Ni base glassy alloy containing Mo

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Abstract
This paper reports some of the low field magnetic properties, and their stability, obtained for a glassy Fe40Ni38Mo4B18 (METGLAS‐ Alloy 2826MB) alloy, which has a Curie temperature of 626 K, room temperature saturation induction of 8.8 kG and a linear magnetostriction of about 9 ppm. When optimally field‐annealed, the toroidally wound material shows a coercivity of about 7 mOe, remanence of 7.5 kG and a dc permeability (at B=100 G) of about 45 000. The material’s ac core loss at B=1 kG and f=104 Hz is close to that (∼1.3 watts/kg) of a tape‐wound crystalline 4‐79 Mo Permalloy core of similar size. The high frequency effective permeability is ∼700 at f=5×105 Hz. This is a factor of ∼7 greater than for 4‐79 Permalloy. The thermal stability of these properties is found to be excellent. The improved thermal and magnetic properties of the present material over Fe‐Ni‐P‐B glassy alloys significantly enhance the opportunity to apply these materials in various magnetic applications.

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